RECENT BRITISH OSTRACODA. 



2. Cttheridea papillosa, Bosquet. (Plate XXYIII. figs. 1-6, and Plate XL. fig. 1.) 



Cytheridea papulosa, Bosquet, Entom. fossil, des terr. tertiair. de la France, p. 42, pi. ii. figs. 5 a, b, c, d. 

 Cythere Bradii, Norman, Brit. Assoc. Report, 1864, p. 192. 



debilis, Norman, Nat. Hist. Trans. Northumb. & Durh. vol. i. p. 15, pi. v. figs. 5-8, and note, p. 28. 



Cyprideis Bairdii, G. O. Sars, loc. cit. p. 52. 



Scandinavian type. Distribution : Recent — Baffin's Bay, Norway, Great Britain. Fossil — Glacial 

 deposits and raised beaches, Scotland and Norway ; tertiary, France and Belgium. 



Valves of the female, as seen from the side, oblong, slightly higher in front than behind, 

 height equal to more than half the length ; the postero-ventral termination somewhat 

 angular. Anterior margin obliquely rounded; posterior sloping steeply with a gentle 

 curve from above downwards, terminating below in an obtusely rounded angle. Superior 

 margin very slightly arched, inferior straight or indistinctly sinuated in front of the 

 middle. Outline, as seen from above, ovate, tumid, rounded at the extremities, the 

 anterior of which is the narrowest ; greatest width behind the middle, equal to half the 

 length ; a slight longitudinal depression along the junction of the two valves behind the 

 middle. End view nearly circular. The shell of the male is much more elongated, and 

 nearly equal in height throughout, the height much less than half the length ; inferior 

 margin more decidedly sinuated. Surface of the shell smooth and shining, cream- 

 coloured, clouded with reddish brown on the dorsal aspect ; beset with distant circular 

 papillae. Lucid spots arranged in a transverse row of four, with two others at a consider- 

 able distance in front. Terminal hinge-processes distinctly crenulated, the intervening 

 portion more slightly so (Plate XXVIII. figs. 5a, b). Terminal joint of the upper anteuna 

 very short, not half the length of the preceding, armed with a long spine and two setae. 

 Spines of the third and fourth joints very robust, ensiform. Branchial appendage of the 

 mandibular palp bearing three seta?. Pirst pair of feet very short, last two joints imper- 

 fectly separated ; terminal claw of the third foot much longer than the second joint and 

 finely ciliated on the margins. Bight foot of the first pair in the male very strong, sul)- 

 cheliform, the last three joints coalescent, very thick and massive, and bearing on the 

 anterior margin a very stout, bearded linguiform process ; terminal claw very strong and 

 bent almost at a right angle ; " right foot of second pair very rudimentary, the terminal 

 portion composed of one very small ovate joint, bearing a short seta on the anterior 

 margin;" the left also different from that of the female, subprehensile, the last three 

 joints thickened ; terminal claw strong and doubly pectinate. Basal portion of the male 

 copulative organs subovate ; terminal portion bipartite, the anterior segment small and 

 obtusely triangular, the posterior larger and produced into an acuminate process. 



Length 3!- in., height in. 

 Hah. In deep water, 10 to 50 fathoms. Hebrides, the INIinch {Mr. J. G. Jeffreys) ; Bute, Loch Fyne and 



Cumbrae, and Ormeshead {Mr. D. Robertson) ; Aberdeenshire {Mr. Dawson) ; Northumberland and 



Durham coasts (G. S. B.) ; Yorkshire coast, off" Scarborough {Mr. Leckenby) ; Thames estuary {Mr. 



E. C. Davison). 



C. papillosa seems to be a strictly northern species, and on the Scotch coasts and those 

 of the north-east of England is one of the most abundant forms. In some few favourable 

 localities, especially in Loch Fyne, it occurs in great profusion, and is associated with 



